US4970555A - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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Publication number
US4970555A
US4970555A US07/315,803 US31580389A US4970555A US 4970555 A US4970555 A US 4970555A US 31580389 A US31580389 A US 31580389A US 4970555 A US4970555 A US 4970555A
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US
United States
Prior art keywords
sheet
image forming
conveying
rollers
sheets
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/315,803
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English (en)
Inventor
Shigenori Obana
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Assigned to KABUSHIKI KAISHA TOSHIBA, reassignment KABUSHIKI KAISHA TOSHIBA, ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: OBANA, SHIGENORI
Application granted granted Critical
Publication of US4970555A publication Critical patent/US4970555A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6555—Handling of sheet copy material taking place in a specific part of the copy material feeding path
    • G03G15/6579—Refeeding path for composite copying
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/23—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 specially adapted for copying both sides of an original or for copying on both sides of a recording or image-receiving material
    • G03G15/231—Arrangements for copying on both sides of a recording or image-receiving material
    • G03G15/232—Arrangements for copying on both sides of a recording or image-receiving material using a single reusable electrographic recording member
    • G03G15/234—Arrangements for copying on both sides of a recording or image-receiving material using a single reusable electrographic recording member by inverting and refeeding the image receiving material with an image on one face to the recording member to transfer a second image on its second face, e.g. by using a duplex tray; Details of duplex trays or inverters
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00367—The feeding path segment where particular handling of the copy medium occurs, segments being adjacent and non-overlapping. Each segment is identified by the most downstream point in the segment, so that for instance the segment labelled "Fixing device" is referring to the path between the "Transfer device" and the "Fixing device"
    • G03G2215/00417—Post-fixing device
    • G03G2215/0043—Refeeding path
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00535—Stable handling of copy medium
    • G03G2215/00544—Openable part of feed path
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00535—Stable handling of copy medium
    • G03G2215/00548—Jam, error detection, e.g. double feeding
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00535—Stable handling of copy medium
    • G03G2215/00556—Control of copy medium feeding
    • G03G2215/00578—Composite print mode
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00535—Stable handling of copy medium
    • G03G2215/00556—Control of copy medium feeding
    • G03G2215/00586—Control of copy medium feeding duplex mode

Definitions

  • the present invention relates to an image forming apparatus such as an electronic copying machine.
  • a conventional electronic copying machine which can perform multiple and both-side image formation has a main convey mechanism and a reconvey mechanism.
  • the main convey mechanism is used to convey a sheet fed from a sheet feed section to a sheet delivery section through a transfer section disposed between a photosensitive drum and a transfer charger and a fixing unit in the order named.
  • the reconvey mechanism is used to separate a sheet conveyed by the main convey mechanism from its path by a gate between the fixing unit and the sheet delivery section, and refeed the separated sheet to a portion between the feed section and the transfer section through a stack section.
  • a sheet is fed again to the transfer section by the reconvey mechanism.
  • an image forming apparatus which includes an image forming means for forming an image on a sheet;
  • main conveying means for delivering the sheet to outside the image forming apparatus through the image forming means
  • reconveying means for separating the sheet from the main conveying means at the downstream side of the image forming means, and merging the separated sheet to the upstream side of the image forming means, the reconveying means being provided with separating means for separating the sheet from the main conveying means to the reconveying means, and, detecting means for detecting a feeding sheet problem in the reconveying means;
  • FIG. 1 is a perspective view showing an embodiment of an electronic copying machine serving as an image forming apparatus according to the present invention
  • FIG. 2 is a view showing a part of a reconvey mechanism shown in FIG. 1;
  • FIG. 3 is a block diagram showing a control system of the copying machine shown in FIG. 1;
  • FIG. 4 is a view for explaining an operation in the reconvey mechanism shown in FIG. 3 when a sheet is jammed.
  • reference numeral 2 denotes a housing of an electronic copying machine serving as an image forming apparatus according to the present invention.
  • An original table (not shown) made of a transparent glass is disposed on the upper surface of the housing 2.
  • An automatic sheet feeder 4 for automatically setting an original on the original table is arranged on the upper portion of the housing 2 so as to cover the original table.
  • Sheet feed and delivery sections 6 and 8 are respectively disposed in the right and left side portions of the housing 2.
  • the housing 2 includes an image forming section 10 for forming an image corresponding to image data of an original on the original table, a main convey mechanism 12 for conveying a sheet fed from the sheet feed section 6 to the sheet delivery section 8 through the image forming section 10, and a reconvey mechanism 14 for refeeding the sheet on which an image is formed by the image forming section 10 to the image forming section 10.
  • the image forming section 10 has a photosensitive drum 16 rotatably supported in the housing 2.
  • a charger 18, a developing unit 20, a transfer charger 22, a separating charger 24, and a cleaning unit 26 are disposed along a rotating direction of the photosensitive drum 16, in the order named.
  • the charger 18 is used to uniformly charge the surface of the photosensitive drum 16.
  • An exposure position 28 in an exposure unit (not shown) is set between the charger 18 and the developing unit 20 around the photosensitive drum 16.
  • the exposure unit is used to illuminate the original set on the original table, to guide its reflected light to the exposure position 28 on the surface of the photosensitive drum 16 and to expose the surface of the photosensitive drum 16, thus forming an electrostatic latent image on the surface of the photosensitive drum 16.
  • the developing unit 20 is used to supply a toner to the electrostatic latent image and form a toner image on the photosensitive drum 16.
  • the transfer charger 22 is used to transfer the toner image carried on the photosensitive drum 16 onto the sheet.
  • the separating charger 24 is used to separate, from the photosensitive drum 16, the sheet electrostatically attracted thereto.
  • the cleaning unit 26 is used to remove the toner, which remains on the photosensitive drum 16 without transferring on the sheet, from the photosensitive drum 16.
  • the image forming section 10 also has a fixing unit 30.
  • the fixing unit 30 is used to fix a toner image on the sheet on which the toner image is transferred.
  • the sheet feed section 6 has upper and lower sheet cassettes 32 and 34 for storing sheets, and upper and lower pickup rollers 36 and 38 for picking up the sheets from these sheet cassettes 32 and 34.
  • the main convey mechanism 12 has a pair of first aligning rollers 42 for aligning the sheet fed from the sheet feed section 6 and conveying the aligned sheet to a transfer section 40 between the photosensitive drum 16 and the transfer charger 22, a conveyor belt 44 for conveying the sheet separated from the photosensitive drum 16 by the transfer charger 22 to the fixing unit 30, and a pair of convey rollers 46 for conveying the sheet on which a toner image is fixed by the fixing unit 30 to the sheet delivery section 8.
  • the sheet delivery section 8 has a pair of sheet delivery rollers 48 for delivering the sheet conveyed by the convey rollers 46 to outside the housing 2, and a sheet delivery tray 50 for receiving the sheet delivered by the sheet delivery rollers 48.
  • the reconvey mechanism 14 has a turn guide mechanism 52 for separating the sheet conveyed by the main convey mechanism 12 from its path at the position between the convey and sheet delivery rollers 46 and 48 and then turning it, a stack section 54 for stacking the sheet turned by the turn guide mechanism 52, and a refeed mechanism 56 for refeeding the sheet stacked in the stack section 54 to the transfer section 40.
  • the turn guide mechanism 52 has a turn guide 58 for guiding the sheet from the position between the convey and sheet delivery rollers 46 and 48 downward, a first gate 60 for selectively guiding the sheets conveyed from the convey rollers 46 to the sheet delivery rollers 48 or to the turn guide 58, a first gate detector 62 arranged near the first gate 60, for detecting that the sheet passes through the first gate 60, two pairs of convey rollers 64 1 and 64 2 , and 66 1 and 66 2 for conveying the sheet guided by the turn guide 58, curl correction rollers 68 1 , 68 2 , and 68 3 for eliminating the curl of the sheet conveyed by the convey rollers 64 1 , 64 2 , 66 1 , end 66 2 , a pair of stack rollers 70 1 and 70 2 for conveying the sheet conveyed by the curl correction rollers 68 1 , 68 2 , and 68 3 to the stack section 54, and a jam detector 72, arranged at the sheet inlet side between the stack rollers 70 1 and 70 2
  • the stack section 54 is disposed to be inclined.
  • the stack rollers 70 1 and 70 2 are disposed to oppose the lower end side of the inclined stack section 54.
  • a stack detector 74 is arranged at the stack section 54 to detect that the sheet is stacked.
  • the refeed mechanism 56 includes pickup rollers 76 for picking up the sheets stacked in the stack section 54 one by one, a pair of separating rollers 78 for separating the picked up sheets one by one, second aligning rollers 80 for aligning the separated sheet and conveying it to the first aligning rollers 42, a second gate detector 82 arranged near the second aligning rollers 80 to detect that the sheet passes therethrough, reverse guide 84 for turning over the sheet during a both-side copying operation, a second gate 85 for conveying the sheet conveyed from the separating rollers 78 to the second aligning rollers 80 during a multiple copying operation, and conveying the sheet to the reverse guide 84 during the both-side copying operation, reverse rollers 86, which can rotate in the correct and reverse directions, for guiding the sheet conveyed through the second gate 85 to the reverse guide 84, and thereafter delivering the sheet from its trailing end, during the both-side copying operation, a third gate 88 for guiding the sheet delivered by the reverse rollers 86 to the
  • the turn guide 58 has first and second fixed guides 92 and 94, and a movable guide 96.
  • the first fixed guide 92 is used to guide one surface of the sheet.
  • the second fixed and movable guides 94 and 96 are used to guide the other surface of the sheet.
  • One of the sheet delivery rollers 48, the convey rollers 64 1 , 64 2 , and 66 1 , the correction roller 68 1 , and the stack rollers 70 1 and 70 2 are supported by the fixed guides 92 and 94.
  • the convey roller 662 and the correction rollers 68 2 and 68 3 are supported by the movable guide 96.
  • the movable guide 96 is arranged pivotably at a predetermined angle about the rotating axis of the stack roller 70 2 , as represented by the imaginary line shown in FIG. 2.
  • the movable guide 96 is pivoted, the interval between the movable guide 96 and the first fixed guide 92, the interval between the convey rollers 66 1 and 66 2 , and the interval between the correction rollers 68 1 , and 68 2 and 68 3 are opened.
  • FIG. 3 shows a control system of the copying machine.
  • reference numeral 98 denotes a control circuit for controlling the entire copying machine.
  • the control circuit 98 receives signals from the image forming section 10, the first gate detector 62, the second gate detector 82, the jam detector 72, the stack detector 74, and the sheet reverse detector 90.
  • the control circuit 98 outputs control signals to the image forming section 10, and first to fourth driving circuits 100, 102, 104, and 106.
  • the first driving circuit 100 drives the main convey mechanism 12 in response to the control signal.
  • the second driving circuit 102 drives the reconvey mechanism 14 in response to the control signal.
  • the third driving circuit 104 drives a first switching mechanism 108 for switching the first gate 60.
  • the fourth driving circuit 106 drives a second gate switching mechanism 110 for switching the second and third gates 85 and 88.
  • the first, second, and third gates 60, 85, and 88 are normally driven so that normal, multiple, and both-side copying operations to be described later are executed.
  • the first gate 60 is pivoted and displaced to the position for preventing the sheet conveyed by the main convey mechanism 12 from being guided to the reconvey mechanism 14, i.e., the position for guiding the sheet from the convey rollers 46 to the sheet delivery rollers 48.
  • the toner image on the photosensitive drum 16 is transferred on one surface of the sheet by the transfer charger 22.
  • the toner image is fixed to the sheet by the fixing unit 30.
  • the sheet is delivered on the sheet delivery tray 50 through the convey rollers 46, the first gate 60, and the sheet delivery rollers 48, in the order named.
  • lower separating rollers 78 are rotated in the reverse direction, so that the lower sheet is returned to the stack section 54, thus conveying only the uppermost sheet. Thereafter, the pickup rollers 76 are moved upward, and the sheet is conveyed to the second aligning rollers 80 through the second gate 84.
  • the sheet is aligned because the second aligning rollers 80 are stopped at this time.
  • the second aligning rollers 80 are rotated, so that the sheet is conveyed to the first aligning rollers 42. Then, an image is formed on the same surface of the sheet as the surface on which the previous image is formed to overlap the previous image.
  • the sheet is delivered on the sheet delivery tray 50 through the convey rollers 46, the first gate 60, and the sheet delivery rollers 48. These operations are continued until all the sheets stacked in the stack section 54 are subjected to the multiple copying, and all the copied sheets are delivered.
  • both-side copying operation the same operations as in the multiple copying operation are performed until the sheet passes through the separating rollers 78.
  • the sheet conveyed by the separating rollers 78 is conveyed to the reverse rollers 86 by the second gate 85 pivoted in the state represented by the imaginary line in FIG. 1.
  • the reverse rollers 86 are stopped, and the second gate 84 is returned to the original state represented by the solid line shown in FIG. 1.
  • the reverse rollers 86 are rotated in the reverse direction, and hence the sheet is conveyed to the second aligning rollers 80 from the trailing end side. Therefore, the sheet is turned over.
  • the sheet When the sheet reaches the second aligning rollers 80, the sheet is aligned because the second aligning rollers 86 are stopped. After the aligning operation is completed, when the second aligning rollers 80 are rotated, the sheet is conveyed to the first aligning rollers 42. Then, an image is formed on the rear surface of the sheet with respect to the surface on which the previous image is formed. Thereafter, the sheet is delivered on the sheet delivery tray 50 through the convey rollers 46, the first gate 60, and the sheet delivery rollers 48. These operations are continued until all the sheets stacked in the stack section 54 are subjected to the both-side copying, and all the copied sheets are delivered.
  • the jam detector 72 detects that the sheet is jammed.
  • the detection signal from the detector 72 is supplied to the control circuit 98.
  • the driving circuit 104 drives the first switching mechanism 108 in response to a signal from the control circuit 98.
  • the first gate 60 is pivoted to the position represented by the solid line in FIG. 1. Therefore, the sheet following the jammed sheet is not guided to the turn guide mechanism 52 but is guided to the sheet delivery rollers 48 by the first gate 60, and is delivered on the sheet delivery tray 50.
  • a sheet p jammed in the turn guide mechanism 52 is removed by causing the movable guide 96 to pivot, and opening the interval between the first fixed guide 92 and the movable guide 94, the interval between the convey rollers 66 1 and 66 2 , and the interval between the correction rollers 68 1 , 68 2 , and 68 3 .
  • the first gate 60 is caused to pivot and displace and the following sheet p is delivered on the sheet delivery tray 50. Therefore, the jammed sheet can be removed while the copying operation is continued, thus reducing time-consumption.
  • the loss of copied sheets can be compensated by copying about one or two more sheets.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Conveyance By Endless Belt Conveyors (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
US07/315,803 1988-03-04 1989-02-27 Image forming apparatus Expired - Fee Related US4970555A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP63-49752 1988-03-04
JP63049752A JPH01226649A (ja) 1988-03-04 1988-03-04 画像形成装置

Publications (1)

Publication Number Publication Date
US4970555A true US4970555A (en) 1990-11-13

Family

ID=12839917

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/315,803 Expired - Fee Related US4970555A (en) 1988-03-04 1989-02-27 Image forming apparatus

Country Status (3)

Country Link
US (1) US4970555A (enrdf_load_stackoverflow)
JP (1) JPH01226649A (enrdf_load_stackoverflow)
DE (1) DE3906105A1 (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5130759A (en) * 1989-09-07 1992-07-14 Kabushiki Kaisha Toshiba Image forming apparatus for forming an image on both sides of a recording medium
US5313258A (en) * 1991-09-30 1994-05-17 Kabushiki Kaisha Toshiba Image forming apparatus for performing a double-sided copying operation
US5459553A (en) * 1993-05-24 1995-10-17 Samsung Electronics Co., Ltd. Method for eliminating a paper jam in an image forming system
US5671466A (en) * 1992-03-24 1997-09-23 Asahi Kogaku Kogyo Kabushiki Kaisha Electrophotographic apparatus and sheet guide mechanism

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19532108C2 (de) * 1995-08-31 1998-09-03 Kodak Ag Ablageeinheit einer Kopiervorrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4497569A (en) * 1982-09-21 1985-02-05 Xerox Corporation Copy processing system for a reproduction machine
EP0219244A2 (en) * 1985-09-30 1987-04-22 Xerox Corporation Machine shut-down control
EP0225546A2 (en) * 1985-11-28 1987-06-16 Mita Industrial Co. Ltd. Electrostatic copying apparatus and auxiliary unit capable of being detachably mounted thereon
US4693586A (en) * 1984-10-30 1987-09-15 Mita Industrial Co., Ltd. Electrostatic copying apparatus
US4835567A (en) * 1986-12-30 1989-05-30 Kabushiki Kaisha Toshiba Paper re-feeding apparatus of image forming apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4231567A (en) * 1978-12-01 1980-11-04 Xerox Corporation Method and apparatus for clearing jams in copiers
US4755855A (en) * 1985-05-30 1988-07-05 Kabushiki Kaisha Toshiba Image forming apparatus with a forming position correcting function
JPS626269A (ja) * 1985-07-02 1987-01-13 Minolta Camera Co Ltd 複写機

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4497569A (en) * 1982-09-21 1985-02-05 Xerox Corporation Copy processing system for a reproduction machine
US4693586A (en) * 1984-10-30 1987-09-15 Mita Industrial Co., Ltd. Electrostatic copying apparatus
EP0219244A2 (en) * 1985-09-30 1987-04-22 Xerox Corporation Machine shut-down control
EP0225546A2 (en) * 1985-11-28 1987-06-16 Mita Industrial Co. Ltd. Electrostatic copying apparatus and auxiliary unit capable of being detachably mounted thereon
US4835567A (en) * 1986-12-30 1989-05-30 Kabushiki Kaisha Toshiba Paper re-feeding apparatus of image forming apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5130759A (en) * 1989-09-07 1992-07-14 Kabushiki Kaisha Toshiba Image forming apparatus for forming an image on both sides of a recording medium
US5313258A (en) * 1991-09-30 1994-05-17 Kabushiki Kaisha Toshiba Image forming apparatus for performing a double-sided copying operation
US5671466A (en) * 1992-03-24 1997-09-23 Asahi Kogaku Kogyo Kabushiki Kaisha Electrophotographic apparatus and sheet guide mechanism
US5459553A (en) * 1993-05-24 1995-10-17 Samsung Electronics Co., Ltd. Method for eliminating a paper jam in an image forming system

Also Published As

Publication number Publication date
DE3906105C2 (enrdf_load_stackoverflow) 1993-04-01
DE3906105A1 (de) 1989-09-07
JPH01226649A (ja) 1989-09-11

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AS Assignment

Owner name: KABUSHIKI KAISHA TOSHIBA,, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:OBANA, SHIGENORI;REEL/FRAME:005049/0862

Effective date: 19890220

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Lapsed due to failure to pay maintenance fee

Effective date: 19941116

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362